By direct action of the oxidant FeIII (C1O4)3, 9H2O on 2,2′-bithiophene, 3-methylthiophene and thiophene, we have been able to synthesize the corresponding polymer. The conductivity of the poly(2,2′-bithiophene)obtained by this reaction is ca 17 (Ω x cm)−1 The efficiency of the polymerization process as well as the conductivity of the obtained polymers seems related to the oxidation potential of the corresponding monomers. 3-Bromothiophene does not polymerize in this way because of its high oxidation potential.
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Mermilliod-thevenin et al. (1985) studied this question.
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